RELATIVE ABUNDANCE CHANGES, STRATIGRAPHIC AND PALAEO-OCEANOGRAPHIC SIGNIFICANCE OF RADIOLARIAN Botryocyrtis scutum IN SOUTH CHINA SEA SINCE PLEISTOCENE
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摘要: 试图通过南海更新世以来3个柱状样中Botryocyrtis scutum (放射虫) 的研究, 探讨其地层和古海洋学意义. 根据南海更新世以来3个柱状样中Botryocyrtis scutum的丰度变化与氧同位素记录的对比研究发现, 氧同位素18期以来Botryocyrtis scutum丰度变化与氧同位素记录有较好的对应关系, 其丰度变化随冰期与间冰期旋回而波动.冰期丰度降低, 间冰期丰度增加.其丰度变化基本上与氧同位素记录一样, 反映了冰期与间冰期旋回, 并且可以作为地层划分和对比的工具.
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关键词:
- Botryocyrtis scutum(放射虫) /
- 丰度变化 /
- 古海洋学意义 /
- 更新世 /
- 南海
Abstract: This paper presents the discussion of the stratigraphic and palaeo oceanographic significance of Botryocyrtis scutum in the three cylindrical samples that have occurred in the South China Sea since the Pleistocene. The relative abundances of the radiolarian Botryocyrtis scutum in the three cylindrical samples in the South China Sea since the Pleistocene are correlated with oxygen isotopic records, indicating that the relative abundance of the Botryocyrtis scutumv corresponds well to the oxygen isotopic records since the MIS 18. The abundance of B. scutum fluctuated during the glacial and interglacial periods, with its high abundance during the interglacial period and the low one during the glacial period. Just like the oxygen isotopic records, the abundance changes of B. scutum indicate the glacial and interglacial cycle and at the same time can be considered as a tool for the stratigraphic classification and correlation. -
图 1 南海17957和17959柱与ODP1146的站位(等值线单位m)
Fig. 1. Location of core 17957, 17959 and ODP site 1146 in the South China Sea
图 2 南沙海区17957柱氧同位素分期与Botryocyrtis scutum的丰度变化
Fig. 2. Oxygen isotopic records and abundance variations of Botryocyrtis scutum in core 17957 of the southern South China Sea
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